In Sky Force, you control your plane using the on-screen joystick to move in any direction. Tap the fire button to shoot and hold it for continuous fire. Use power-ups found in-game to enhance your attacks.

To earn more stars, complete missions with higher efficiency. Focus on destroying all enemies, rescuing lost allies, and finding hidden items to maximize your score. Avoid taking damage and finishing the mission quickly also helps.

Upgrade your aircraft by collecting currency during missions. Access the hangar from the main menu, select your plane, and choose the upgrades you want to apply. Prioritize enhancements for weapons, armor, and speed for better performance.

Power-ups are temporary enhancements that provide advantages during gameplay. You can find them throughout missions. To use a power-up, activate the corresponding icon that appears on-screen when collected. Choose wisely based on your current situation.

Unlocking new missions and planes requires progressing through the game. Complete initial missions to gain access to more challenging ones. You can also achieve specific objectives to unlock new planes. Pay attention to mission requirements and complete them effectively.